Run ssh server on my notebook through wireless conection

MattFly · 08-18-2015, 06:02 PM

Is there anyway to test and determine where's the trouble?

michaelk · 08-18-2015, 06:34 PM

I assume you were successful with connecting on the LAN side using another computer?

Post the output of the command:

nmap -p 22 your-external-IP-address

MattFly · 08-18-2015, 07:02 PM

Yes I was! heres's the output of the requested command:

Code:

Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-18 21:01 BRT
Nmap scan report for ***************.xd-dynamic.algartelecom.com.br (**********)
Host is up (0.0093s latency).
PORT   STATE    SERVICE
22/tcp filtered ssh

Nmap done: 1 IP address (1 host up) scanned in 1.07 seconds

When I try to connect it gives me connection timed out, as it allways was.

michaelk · 08-18-2015, 07:41 PM

The state should be opened versus filtered. It looks like the router's firewall is still blocking port 22. I assumed you saved the settings in the router. I might reboot it just to make sure it loads the new configuration.

frankbell · 08-18-2015, 07:48 PM

Maybe someone has addressed this, but I skimmed through the posts and, if it was there, I missed it.

If I remember correctly, Ubuntu does not include the ssh server by default, only the client. sshd needs to be installed from the repos. Once it is installed, you can check whether it is running by

Code:

$ ps -A | grep sshd
 1239 ?        00:00:00 sshd   <---returned if the ssh server is running.

If this is superfluous, my apologies.

michaelk · 08-18-2015, 07:52 PM

Code:

 ps ax | grep sshd
  430 ?        Ss     0:00 /usr/sbin/sshd -D

Its running...

MattFly · 08-18-2015, 08:03 PM

Now I tweaked a little bit and found something called dmz where I placed my notebook stable ip. I definitelly disabled my firewall. Not working yet:

Code:

root@matt-Vostro-5470:/home/matheus# nmap -p 22 ***.***.***.***

Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-18 21:59 BRT
Nmap scan report for 191-054-216-231.xd-dynamic.algartelecom.com.br (***.***.***.***)
Host is up (0.0071s latency).
PORT   STATE    SERVICE
22/tcp filtered ssh

Nmap done: 1 IP address (1 host up) scanned in 0.71 seconds
root@matt-Vostro-5470:/home/matheus# ssh sshclient@***.***.***.*** -p 22 -vvv
OpenSSH_6.7p1 Ubuntu-5ubuntu1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to ***.***.***.*** [***.***.***.***] port 22.
debug1: connect to address ***.***.***.*** port 22: Connection timed out
ssh: connect to host ***.***.***.*** port 22: Connection timed out
root@matt-Vostro-5470:/home/matheus#

Any Ideas left?

michaelk · 08-18-2015, 08:15 PM

Does not look like the router's port forwarding is working assuming everything else is. That is why I suggest rebooting it.

MattFly · 08-18-2015, 08:24 PM

Now I did rebooted and it stills the same problem.

MattFly · 08-18-2015, 08:27 PM

I saw somewhere that I can try connecting to my router using telnet and then trying to configure it. It was something useful for the d-link wireless where I read it. But when I tryied "telnet 192.168.0.1 80" It just took a while and returned conection closed by a unkown host ????

MattFly · 08-18-2015, 08:32 PM

Don't now if have something to do with that, provided that I can connect from my internal wlan, but here's one more thing:

Code:

$ sudo iptables -L -v -n --line-numbers
Chain INPUT (policy ACCEPT 99 packets, 10801 bytes)
num   pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 109 packets, 10061 bytes)
num   pkts bytes target     prot opt in     out     source               destination

MattFly · 08-18-2015, 10:08 PM

Something else?

michaelk · 08-19-2015, 08:13 AM

Something is blocking the port but I can not tell if it is your router.

MattFly · 08-19-2015, 08:52 AM

I`ll make a test connecting my laptop directlly to my modem throught Lan (wired), then I'll test if ssh from my public ip. If that works the problem is with my router, if that don't there might be something wrong about my Isp, which i hope is not the case. I'm I right? I mean, provided all the situation that I did, this could locate where the throuble is going? Did i think right?

michaelk · 08-19-2015, 09:18 AM

Yes. I would turn on the laptop's firewall as a precautionary measure and as you posted have configured it for ssh. I would also recycle power on the MODEM first since many ISPs will only allow on IP address based on the devices MAC.